package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 用户端 jwt令牌校验拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Resource
    private JwtProperties jwtProperties;

    /**
     * 校验用户端 jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 判断是否为Controller方法
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        // 从请求头中获取 token
        String token = request.getHeader(jwtProperties.getUserTokenName());

        // 校验 token
        try {
            log.debug("用户端 jwt校验: {}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户 id：{}", userId);
            BaseContext.setCurrentId(userId);
            return true;
        } catch (Exception ex) {
            // 校验失败，返回 401
            response.setStatus(401);
            return false;
        }
    }
}
